(1) Choose the appropriate varieties of phosphate fertilizer. The use of superphosphate is wider and the effect is better, followed by calcium magnesium phosphate fertilizer, and the effect of phosphate rock powder is poor. (2) Determine the application amount depending on the condition of the water body. The amount of fish ponds is increased by 15%, and the amount of furrows, canals, and lakes is increased by 20%. After the application, the water becomes lighter (transparency 25-30 cm), and yellow-green or brown-green is preferred. (3) Pay attention to fertilization methods. In general, it should be mixed with organic fertilizer or other nitrogen fertilizers. When mixing with nitrogen fertilizer, apply phosphate fertilizer first and apply nitrogen fertilizer later. Do not invert it so as not to cause dead fish. When applying alone, it is best to dissolve the phosphate fertilizer first and spray it on the surface of the water with a sprayer or spray it evenly. It is also possible to use a bag of phosphate fertilizer and hang it on a fixed stake in the water. (4) The casting time should be appropriate. June-September is the best season. Every day, the amount of water to be sprayed per acre is about 1 kilogram. 10 days is a cycle, and another cycle is followed by a cycle of two weeks. (5) The proportion should be reasonable. The proportion of superphosphate and urea should be 1:1, and the proportion of old fish ponds with some organic matter can be increased to 2:1. Other nitrogen fertilizers are converted into urea according to their nitrogen content, which is reasonably calculated.
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